Rock-drill.



T. F. CARROLL.

ROCK DRILL. Arrmonrox funn Nov. 17, 1909.

Patented J an. 30, 1912.

FI d T. R'GARROLB.

ROOK DRILL.

Arruoyrlon nnnn Nov. 11. moo.

1,015,780. Patented Jan.3o,1912.

2 SHEETS-SHEET 2.

THOMAS FRANCIS CARROLL, OF MOUNT' CARMEL, PENNSYLVANIA.

ROCK-DRILL.

Application filed November 17, 1909.

Specification of Letters Patent.

Patented Jan. 30,1912.

serial No. 528,506.V

To all whom tt may concern:

Be it known that I, THOMAS F. CARROLL, a citizen of the United States,residing at Mount Carmel, in the county of Northumberland and StateofPennsylvania, have 1nvented a new and useful Improvement 1n Rock-Drills1of which the following is a specification.

This invention relates to rock drills, and more particularly to thatclass of drills used in coal mines, the object being to provide a drillwhich is so constructed that the same can be readily operated with onehand thereby enabling the operator to have free use of his other handfor guiding and feeding the drill.

A further object of my invention is to provide a novel form of feedwhereby the same can be readily locked or unlocked so as to regulate thefeed easily and quickly.

A still further object of the invention is to provide a drill which isexceedingly simple in construction and one in which the parts are soformed that a very strong and durable drill is obtained.

Another object of my invention is to provide a supporting or grip barfor the main frame whereby the screw shaft can be readily held in such aposition as to cause the bit carried thereby to bore the Vhole in thedesired position.

Still another object of the invention is to provide a drill which isoperated through the medium of beveled gears, one of which is keyed uponthe screw shaft so as to slide longitudinally thereon.

With these various objects in view, my

invention consists in the novel features of construction, arrangementand combination of parts, all of which will be hereinafter fullydescribed and pointed out in the claims.

In the drawings forming a part of this specification: Figure l is a sideelevation of my improved drill, showing the same in an operativeposition. Fig. 2 is a top plan view of the drill. Fig. 3 is a detaillongitudinal section through the same, and Fig. 4: is an end view.

In carrying out my improved invention, I employ a rectangular frame Awhich is provided with journal boxes B and C in which is revolublymounted a screw shaft D which is provided with a Llongitudinal groove Dand is adapted to carry a bit E of any desired construction at itsforward end which is secured thereon' by any suitable means.

Keyed on the screw shaft D is a beveled gear F which is so mounted thatthe same can slide longitudinally on the shaft or in other words, theshaft can slide longitudinally through the gear and said beveled gear isprovided with a hub portion F having an integral key F2 which workswithin the groove D of the screw shaft D so that when the gear F isrotated the screw shaft will be driven so as to cause the bit to bore ahole.`

For operating the beveled gear F, I provide the frame with journal boxesG which can be placed upon either end and secured-by bolts G so that byplacing .the same upon one end a right hand drill will be formed and byVplacing the same upon the other end a left hand ldrill will be formed.Vithin the journal box Gr is a shaft II which carries a beveled gear Iat one end which meshes with the beveled gear F and is provided with acrank arm J at its outer end for operating the same and it will be seenthat by turning the crank the beveled gear I will be rotated which inturn drives the beveled gear F causing the screw shaft D to rot-atetherewith.

The journal box B is provided with a j sleeve portion B on which isrevolubly mounted a' bushing K which is keyed within the hub L of a handwheel L, said hub being provided with a ange L2 which is hammered orpressed over an annular rib so as to hold the wheel in position thereonin such a manner that the same can freely rotate and yet be stopped frommoving rearwardly. The bushing K carries a guide bracket M in which isslidably mounted a bolt N adapted to fit within the threads of the screwshaft D so that when thrown into engagement therewith and the Shaftoperated the same will be forced forwardly so Vas to cause the bit to beforced into engagement with the rock or' coal upon which it isoperating. l

For operating the bolt N, I provide one of the spokes of the wheel Lwith a bracket O in which is pivotally mounted a lever Pl which carriesa link P having a bifurcated end which is pivotally mounted overthereduced end N of the bolt N so that when the lever is thrown intoposition as shown in Figs. 3 and 4, the bolt will be thrown into meshwith the threads 0f the screw clearly shown to which is detachably con-lnected a supporting or grip bar R which is adapted tobe driven into therock or coal as clearly shown in Fig. 1 for supporting the frame and itwill be seen that by this construction the main frame can be held in aperfectly horizontal position or by shifting the angle lor inclinationof the supporting or grip bar R with reference to the rock wall or orevein being worked upon it can be made to assume any' position desired.

'Ihe operation of my improved` drill is asy follows: With the drill inthe position shown in Fig. 1 and the bolt N in engagement with thethreads of the drill rod D the turning ofthe crank handle J will operatethe gears I and F and rotate the rod D and bit. The device is steadiedby the operator holding the wheel L with the left hand and while turningthe handle J with the right. The bit will therefore be rotated i andwill at the same time be fed forward. By throwing the lever P downwardlythe bolt N will be drawn out of engagement with the threads and thefeed. will cease. If at any time that it is desired to throw the bolt Nback into engagement wit-h the threads of the rod D and the relationbetween the rod and the said bolt, by reason of a' slightl longitudinalmovement of the rod while loose the bolt will not enter the thread whenthe position shown in Fig. L1 a partial rotation of the wheel L one wayor the other will carry the bolt into a position in which it will atonce fall into proper engagement with the thread and the feed can thenvbe at once resumed.

Having thus fully described my invention, lwhat I claim as new anddesire to se.-

ycure by Letters Patent, is:

1. A rock drill comprising a screw shaft, a Vcrank shaft, beveled gearscarried respectively upon said shafts, and adapted to transmit themotion of the crankshaft to the screw shaft, a revoluble feed wheel, anda slidable bolt carried bysaid feed wheel and adapted to engage saidscrew shaft.

2. in a rock drin, the Combination with a frame, of a supporting bar forsupporting said frame, 'a screw shaft slidably mounted in said frame,means for driving said 'screw shaft, and a hand wheel revolubly mountedi 0n said frame, and a slidable bolt carried by said wheel for engagingsaid screw shaft. 1

3. In a drill of the4 kind described, the combination with a main frameprovided with bearings, of ascrew shaft slidable and c rotatably mountedin said bearings, oneI of said bearings having a sleeve portion, abushing rotatably mounted upon said sleeve, a hand wheel carried by andkeyed to said bushing, a guide bracket carried by said bushing, a boltSlidably mounted in said bracket, a second bracket carried by the handwheel, a lever carried by the second mentioned bracket, a linkconnecting said bolt and said lever, and means for driving saidscrewshaft, the said bolt being adapted to engage the threads of said shaft.

THOMAS FRANCIS CARROLL. 1

Witnesses:

Jol-1N E. CoYLE, MICHAEL F. CoRooRAN.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of llaten'cs.

Washington, D. C.

